Searching for a case sensitive string (or a string with colon)?

henrikba says:

Hi,Is there a way I can search "case sensitively" on a string?

Reason; I prefix some tasks with codes for easier sorting (mostly when they are few enough to not create a tag), and to keep lists sorted. How can I search to match* "PRI: Task 1" and "PRI: Task 2", ...but not "Remember to set priority for milk-task"?

If I search "PRI", I get all of the above examples.Seems I cannot search for a string containing a colon either; e.g. searcing "PRI:" returns no results.